Recent questions tagged dart

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dart - What is the relation between stateful and stateless widgets in Flutter?

A stateful widget is defined as any widget which changes its state within its lifetime. But it is a very ... and stateless widgets in Flutter? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter: Expanded vs Flexible

I've used both Expanded and Flexible widgets and they both seem to work the same. What is the difference between Expanded and Flexible? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How to achieve precompiler directive like functionality

I'm developing an angular app, and it's recommended to use generated code for a lot of things running in ... automatic way to achieve this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Instantiate a class from a string

In dart is it possible to instantiate a class from a string? For example: vanilla in javascript: var myObject = ... @"MyClass") alloc] init]; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Unhandled Exception: InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'List<dynamic>

I am trying to get the JSON response from the server and output it to the console. Future<String> login() ... List What could be the reason? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter - Layout a Grid

I am trying to layout a 4x4 grid of tiles in flutter. I managed to do it with columns and rows. But now I ... seem to get the results I want. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How to upload images and file to a server in Flutter?

I use a web service for image processing , it works well in Postman: Now I want to make http request in ... I write the body of request? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter Switching to Tab Reloads Widgets and runs FutureBuilder

The issue: I have 2 tabs using Default Tabs Controller, like so: Widget build(BuildContext context) { return ... done so by user.) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Force Flutter navigator to reload state when popping

I have one StatefulWidget in Flutter with button, which navigates me to another StatefulWidget using Navigator.push( ... it should force redraw) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter: disable screenshot capture for app

I am making a Flutter app and I need to make sure the user is not able to capture screenshot of the app ( ... code for both Android and IOS? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Error: Only static members can be accessed in initializers what does this mean?

I have something like this. I am having difficulty understanding this error. Why does accessing filterController here ... I resolve this issue? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - When should I use a FutureBuilder?

I was wondering when I should use the future builder. For example, if I want to make an http request and show ... ? Hope it's clear enough! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How can I get the size of the Text Widget in flutter

I've painted a shape for the background of my content of Text. I want the background autoscale the Text, even ... code ... The bubble effect: See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How to change the application launcher icon on Flutter?

When I create an app with a flutter create command, the flutter logo is used as an application icon for ... the icons are generated somehow?. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter setState to another class?

I have a root class RootPage which is a StatefulWidget which is always in view. I would like to change the body ... keep my Root always in view. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter : Bad state: Stream has already been listened to

class MyPage extends StatelessWidget { @override Widget build(BuildContext context) { return DefaultTabController( length: ... listened to. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How to take a screenshot of the current widget - Flutter

I need to take a screenshot of the current screen or widget and I need to write it into a file. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How do I determine the width and height of an image in Flutter?

Assume I have declared my image in my pubspec.yaml like this: assets: - assets/kitten.jpg And my Flutter code is this ... 's Image to dart:ui's Image.) Thanks! Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter TextFormField hidden by keyboard

NOTE: Im using Navigator.of(context).push to push ModalRoute, Hi I have page with ModalRoute with TextFormField ... and more, still same result please help me Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter Countdown Timer

How can I do to put the value passed in the construction, to make a timer that rounds to the first decimal and shows at the ... , fontSize: 50.0), ), ), ); } } Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How do I use hexadecimal color strings in Flutter?

How do I convert a hexadecimal color string like #b74093 to a Color in Flutter? I want to use a HEX color code in Dart. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How do I pass non-string data to a named route in Flutter?

I have many screens, and I'm using the Navigator. I'd like to use "named routes", but I also need to pass ... can I use a named route + send non-string data? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter - Read text file from assets

I have a text file (.txt) that I'd like to be an asset that I can scan in later. In the pubspec.yaml, I ... test. Any ideas on how to properly do this? Thanks! Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter how to programmatically exit the app

How can I programmatically close a Flutter application. I've tried popping the only screen but that results in a black screen. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter get context in initState method

I'm not sure if the initState is the right function for this. What I'm trying to achieve is to ... similar problem: Flutter Redirect to a page on initState Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Is there a way to load async data on InitState method?

I'm a looking for a way to load async data on InitState method, I need some data before build method ... .signInSilently(); } I will appreciate any feedback. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter- wrapping text

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How does the const constructor actually work?

I've noticed it's possible to create a const constructor in Dart. In the documentation, it says ... const constructor different from a regular constructor? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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